Mule's Island is located in Lake Neva, north of Abyssal City, and the island is beautiful with birds and flowers. Relying on the advantages of the local medicinal herb planting industry and the developed pharmaceutical industry, the island has vigorously developed the medical tourism industry with the care and support of leaders at all levels in the past 100 years, and has achieved remarkable results.

Lake Neva provides extremely convenient conditions for water transportation in the northern area of Abyss City, but the lake in the north of Abyss City is mostly a cliff several meters high, and the water flow from the source of the Ladoga River flowing out of Lake Neva is too turbulent, and you have to go north to get to the island by boat.

Charles and Diana hired a rental boat to head towards the island, and the two of them were sitting on the bow of the boat chatting at the moment.

"Ask you something. Charles suddenly whispered to Diana, "Do you think you can theoretically rub a nuclear bomb here?"

Diana reached out and touched Charles's forehead, and then said, "It's hopeless, wait for death, farewell." ”

Charles took Diana's hand down, and then Diana pulled her hand out of Charles's claws, poked his head and said, "You've seen too much on the Internet, and you're still rubbing nuclear bombs, don't you think like my dad thinks that you can blow up a mushroom cloud by turning the doors of Hogwarts into uranium-235 with Transfiguration, right?"

Charles nodded dumbly.

"Are you cheating money when you are an expert on the Manhattan Project and an expert at the state-run 221 Factory? Heisenberg was unable to grasp the theory of building an atomic bomb until the death of the mustache. Diana looked at Charles with disdain and said, "Even if you put a lot of uranium-235 or plutonium-239 together and put them above the threshold, they won't produce a nuclear explosion, they will just cause a chain reaction." ”

"All you get is a pile of thick slurry with high radiation and high temperatures, and the difference between that thing and the mushroom cloud is bigger than the difference between the charcoal lit during the barbecue and the explosion of black powder, which can only rely on high radiation to produce some lethality, and the mushroom cloud is nothing to count on. ”

Charles scratched his head, blushed and said, "I see." ”

"What do you think? Diana grabbed Charles's claws, first clenched his claws into fists, and then snapped his fingers in order and said: "To make a mushroom cloud, you must first have a large number of neutrons - and fast neutrons - so that the chain reaction can occur in a very short time, how are you going to get the neutron source? That thing has a limited shelf life, and an important job in maintaining a nuclear warhead is to replace the neutron source, and the main material Polonium-210 has a half-life of less than five months." ”

"Secondly, the neutrons emitted by the neutron source are diffused in all directions, and you have to have reflective focusing mirrors to reflect the scattered neutrons onto the fissile material, so that the chain reaction can happen in an instant. Do you know how to get this thing, what kind of elements you need, how many you need and how to process them?"

"Third, high-energy explosives are needed to accurately compress subcritical fissile material together in a millionth of a second or less. At the beginning, the state-owned 221 factory made thousands of models for this step, and finally selected one of them. In terms of explosive mechanics, how much do you know, what is the composition of explosives, and can you build a detonator that can meet the conditions?"

"Fourth, will you mine and purify nuclear materials, and will you make other accessory materials?"

"Fifth, at the beginning, the state-owned 221 factory used an abacus to calculate the data, and later the complex calculations were made using the 119 computer of the Chinese Academy of Sciences and other newly developed computers with a speed of 50,000 times per second, and I don't think I can get a computer of this level in the short term. ”

"I won't talk about anything else, Heisenberg didn't even get a gun detonation in the first place, and the first time he calculated the critical mass was not until he was captured after the war, do you think your head is smarter than the Nobel Prize winner in physics?"

"Looks like I'm overthinking. Charles continued to say embarrassedly, "How do you know this so clearly?"

"Nothing. Diana continued to play with Charles's paws, "My best friend - the one who gave me the bag - she learned this, she bragged to me a lot at the beginning, and she disappeared after graduation. ”

"It's good that the world has evaporated. Charles nodded and said, "I heard that the state also allocates objects. ”

Diana didn't follow his train of thought for a while, and was stunned for a while.

Charles said a little discouraged: "It seems that this road is very difficult to walk." ”

"Not really. "There were more than 10 Nobel Prize-winning scientists in the Manhattan Project, 1,000 scientists in other industries, and 2,000 clerks. ”

"The Manhattan plan invested two billion dollars, and at that time the Fletcher class was 10 million, the Essex class was more than 70 million, and the earlier Mrs. Lie was about 50 million. ”

"Do you think you have so much manpower, material and financial resources to carry out the 'Brilliant Radiation' mission?"

"Anyway, have you passed the high math, can your knowledge reserve meet the requirements of ordinary scientific researchers?"

Charles's face darkened, "Believe it or not, I'll throw you in the water, then make a mark where you fell into the water, and fish you up again when you get to the shore!"

Diana's eyes narrowed, "If you have the ability, you will try?"

"Forget it. Charles shook his head, "The water is too cold, and I feel sorry for you and me if it freezes." ”

"Tsk......" Diana glanced at him.

Charles asked at this time, "Then what you said last time that since the divine power can be condensed into Artoria, then it also means that the mass-energy formula can work?"

Diana shook her head helplessly and said, "I'm not here to take care of you, so I used an analogy that you can understand." ”

She continued, "What do you think is the meaning behind E=mc2?"

She then explained, writing the derivation of the mass-energy formula in the middle of Charles's palm:

After the time interval dt has passed under the action of the external force F, the mass of the particle becomes m, the mass increment is dm, the velocity is v, the velocity increment is dv, the displacement is dx, the momentum increment is dp, the total energy increment is dE, and the vacuum speed of light is c.

dE=Fdx=(dp/dt)dx=vdp=vd(mv)=v(mdv+vdm)=mvdv+v2dm··· ①

&nb?/√(1-(v2/c2))

?

m2=m?2/(1-(v2/c2))

?

m2c2=m?2c2/(c2-v2)

∵c>v∴c2-v2≠0

?

m2c2(c2-v2)=m?2c2

?

&nb2c2(c2-v2)]/dv=d(m?2c2)/dv

∵ m?,c are constants;

∴d(m?2c2)/dv=0

?

(c2-v2)d(m2c2)/dv+m2c2d(c2-v2)/dv=0

?

mvdv=(c2-v2)dm··· ②

Bring (2) into (1) to get:

dE=(c2-v2)dm+v2dm=c2dm

The sum of the total energy increments of the particles is:

∫dE=∫??? c2dm=c2m∣??? =mc2-m?c2

That is, when the particle is at rest, its total energy is E=m?c2

After writing it, Diana said to Charles, "Say, how do you put magic into the mass energy formula?"

"Magic is also an energy, and since it is universal in this world, it is not necessarily applicable to past experiences. ”

"Could it be that Artoria wiped her neck herself, and she could blow up more terrifying than Big Ivan?"

"If you and Artoria have a baby one day, will your baby be fried?"

Charles was almost dizzy at this time, and he finally said: "It seems that the research on the brilliant radiation should be done for others first." ”